How about some RPGish chat window commands:
/afk - someone tries to send you a tell, they get an automated afk message back so they know you aren’t just ignoring them…unless you are that is…
/roll - random D10 role so if two players want one hero, its purely a random chance, also can settle many arguments or disputes with the luck of a roll
/MOTD(Message of the Day) - Set a MOTD that others can see if they send you a tell with MOTD keyword (i.e. /whisper BigT MOTD, return message is BigT’s stored MOTD
Many more, but, I think u get the idea…